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Agar is a substance like jelly which coems from red algae. It is made from agarose, and a mixture of molecules known as agaropectin.

In the 19th century, agar was used to make some kinds of bacteria. Today, it is used to make desserts, as a laxative, and in the process of brewing.

The word "agar" comes from the Malay word agar-agar, a word which is used for "red algae", where the jelly comes from.

It is used as a place to grow bacteria in an microbiology laboratory, and to make some foods, like soup, thicker.